Koh Tachai Pinnacle (The Plateau)

A submerged pinnacle/plateau about 49km north of the Similans. Strong current makes it advanced-only. The island itself has been closed to landing since 2016; the dive sites remain open.

Depth

12–40m

Current

Strong

Diver level

Advanced open water

Entry

Boat

Unique features

Granite boulder plateau dressed in soft corals and sea fans
Reputed manta and occasional whale-shark aggregation site
Schools of trevally, barracuda and reef fish

Sources & last checked

Checked July 2026

This is a researched draft, not yet human-verified. The seasonality and logistics are drawn from the sources below — confirm specifics (permits, fees, closures) with an operator before you book.

Diving the Similan and Surin Islands — ZuBlu
Similan Islands Diving — SSI

Note on the data: Coordinates are approximate; not surveyed dive-site GPS.